3-quinazolinylpenicillanic acid

ABSTRACT

THIS INVENTION IS CONCERNED WITH NOVEL 3-QUINAZOLINYLPENICILLANIC ACIDS.

U te Pat 3.-QUINAZOLINYLPENICILLANIC ACID ABSTRACT OF THE DISCLOSURE This invention is concerned with novel 3-quinazolinylpenicillanic acids.

. ,Novel..3 quinagolinylpenicillanieg acid derivatives have i p. pare asfLwellQtts intermediates for their producompoun :are'ot type set forth in For- R and Rgare independently selected from the group' consisting' of hydrogen, halogen, (lower)alkoxy, (doweflallcyl and sulfamoyl; R i'is' selected from the group consisting f hydrogen, .carboxy, phenyl, halophenyl, (lsw rl l qggy hsexfi '(low m y p and alkyl; R; selected from the group consisting of hydrogen andilowgnallgyl,

"Armed herein, the fem"; (lower)alkyl is meant to include straight and branched chain hydrocarbon groups containing one to about six carbon atoms such as methyl, ethyl, n-propyl, i-propyl, hexyl, etc. The terms halo and halogen are used to include chlorine, bromine, fluorine and iodine. By -"(lower -)alkoxy is meant hydrocarbonoxy groups containing one to about "six carbon atoms such as methoxy, ethoxfi propoxy, butoxy, etc.

The com dundser thej invefition may be prepared by reacting the appropriate o-aminoaroyl derivative with 6 isocyanatopenieiliaiiic acid?- trimethylsilylester. The "reactidn-is'conductd 111 21 11 anhydrous organic solvent such dry methylene chloride; dry" benzene,- ordry dimethylfiirmanii 'Ihe presence of moist uretends to hydrolyze u dffof the' 6- isodyanatopenicillanic acidand prevent the formation of the compounds of the invention. Also if water is presentit will react with 6-isocyanat o group to yield a bis-compound. The intermediate 3-ciiiinaiolinylpenicillanic acid trimethylsilyl ester may bio;isolatediiby1 removal of the solvent in yaouo jlhe 3 ;quinagolinylpenicillanic. acids may be then prepared b'y' hydrolyiifig the compounds in the presence of water or aqueous i norganicacid such as hydrochloric acid.

The compounds of the invention may be prepared as follows:

3,652,547 Patented Mar. 28, 1972 wherein R 'R R and R are the same as hereinabove set forth.

The 6-isocyanatopenicillanic acid trimethylsilyl ester employed as a starting material may be prepared as follows:

A solution of 60 mmoles of 6-aminopenicillanic acid trimethylsilyl ester in 250 ml. of toluene is slowly added dropwise, in a nitrogen atmosphere, to a well stirred mixture of 132 mmoles of triethylarnine, about 150 mmoles of phosgene and 90 ml. of toluene; the temperature of the reaction mixture is kept below -40 C. Stirring is continued for 3 hours; the reaction mixture is then filtered under nitrogen at 40 C. while the combined filtrates are evaporated under reduced pressure to a final volume of ml. The solution contains about 0.71 mmoles of the trimethylsilyl ester of 6-isocyanatopenicillanic acid, per ml. of solution.

The compounds of the invention have antibacterial activity and are are useful for the treatment of bovine mastitis. They may be employed in the treatment of bacterial infections such as those amenable to treatment with benzylpenicillin. The compounds are effective in inhibiting Staph. aureus, Smith when applied at a concentration of less than 250 mcg./ml. in aqueous media.

The following examples are added to illustrate but not to limit the scope of the invention.

EXAMPLE 1 6 (6 chloro 1,2,3,4 tetrahydro-4-hydroxy-2-oxo-4- phenyl 3 quinazolinyDpenicillanic acid, trimethylsilyl ester 3 EXAMPLE 2 6- l,2,3,4-tetrahydro-4-hydroxy-2-oxo-4-phenyl-S-quinazolinyl)penci1lanic acid, trimethylsilyl ester To 90 ml. of dry benzene were added 2.5 g. of 2- aminobenzophenone and 4.02 g. of trimethylsilyl-G-isocyanatopenicillanate and the mixture is stirred for 2 /2 hours at ambient temperature. The reaction mixture is placed in the -10 C. cold room overnight and after thawing the benzene is removed in vacuo. The oily residue is dissolved in anhydrous ether, filtered, and the filtrate evaporated under N The residue is triturated with pentane, filtered, and dried.

EXAMPLE 3 6- l,2,3,4-tetrahydro-4-hydroxy-4-methyl-2-oxo- 3-quinazolinyl)penicillanic acid To 100 ml. of dry benzene is added 5.0 g. of trimethylsilyl-6-isocyanatopenicillanate and 2.23 g. of ortho-aminoacetophenone and the mixture is stirred at ambient temperature for 4 /2 hours. After standing overnight at 10 the frozen mixture is allowed to thaw to room temperature and the benzene is removed in vacuo. The oily residue is triturated with hexane and the solid material is filtered and dried. M.P. 119 d. 51% fl-lactarn ring in tact.

EXAMPLE 4 3-(2-carboxy-3,3-dimethyl-7-oxo 4 thia-l-azabicyclo [3.2.0]hept-6-yl)-1,2,3,4-tetrahydro-4-hydroxy 2-oxo- 4-quinazolinecarboxylic acid To a solution of 2.6 g. (0.0127 111.) of potassium isatate in 30 ml. of dimethylformamide is added 4.0 g. (0.0127 m.) of trimethylsilyl-6-isocyanatopenicillanate. The solution is stirred for 18 hours and then poured into 200 ml. of methylene chloride. The solid is then filtered and added to an aqueous solution of sodium bicarbonate. It is precipitated out by adding HCl until a pH of 1.5 is reached,

EXAMPLE 5 The following compounds are prepared by procedures analogous to Example 4:

4 N R; =o

| s CH: N r I R O=-N oooH R1 R1 R3 R4 H -Br oooH H H F CH: CH; (II-I30 CHaO 01H; CH3 H 1 03111 c,H CgH5O H 04H C2H7 H our, H H

H Nmso, 1r

-oon H C3H7O H 11 cimo H 0,11

Whatis claimed is: r 1. A compound selected from the group having the formula:

wherein R and R are independently selected from th group consisting of hydrogen, halogen, (lower)alkoxy, (lower)alkyl and sulfamoyl; R is selected from the group consisting of hydrogen, carboxy, phenyl, halophenyl, (lower)alkoxyphenyl, (lower)alkylphenyl and (lower) alkyl; R; is selected from the group consisting of hydrogen and (lower)alkyl.

2. A compound as described in claim 1 which is 6-(6- chloro-1,2,3,4-tetrahydro-4-hydroxy 2 oxo-4-phenyl-3- quinazolinyl)penicillanic acid, trimethylsilyl ester.

3. A compound as described in claim 1 which is 6-(1, 2,3,4-tetrahydro 4-hydroxy 4-methyl-2-oxo 3-quinazolinyl)penicillanic acid.

4. A compound as described in claim 1 which is 6-(1, 2,3,4-tetrahydro-4-hydroxy 4 methyl-2 ox0,-3.-quinazoliny1)penicillanic acid.

5. A compound as described in claim 1 which is 3-(2- carboxy-3,3-dimethyl-7-oxo 4 thia-1-azabicycl0[3.2.0] hept-6-yl)-1,2,3,4-tetrahydro 4-hydroxy 2-oxo-4-quinazolinecarboxylie acid.

6. A compound selected from the group having the formula: g

s CH: 1

N i R z- I W CH Hi7 R3 OH O COOSKCH References Cited UNITED'STATES PATENTS 3,225,058 12/1965 Juby et a1, 260- 2321 NICHOLAS S. RIZZO, Primary Examiner U.S. Cl. X.R. 424-271 

